Help please.

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?